The Sigma Corporation is pleased to announce a chargeable service for installing the Rear Filter Holder FHR-11 on the SIGMA 14mm F1.8 DG HSM | Art for Canon.

From September onwards, the dedicated service staff for Sigma products will be able to install the Rear Filter Holder FHR-11 on SIGMA 14mm F1.8 DG HSM | Art for Canon.

The Rear Filter Holder FHR-11 is an accessory exclusively designed for the SIGMA 14mm F1.8 DG HSM | Art for Canon, and it enables photographers to use a filter sheet with the lens.By attaching it to the rear of the lens, it will allow more freedom of expression.

For details of cost and the commencement of the service, please contact your nearest authorized SIGMA subsidiary / distributor.In case it is not convenient for your environment to use the installation service and you prefer to do it by your own effort, the necessary parts can be sold.Please contact your nearest authorized SIGMA subsidiary / distributor for further information. Customers who do not own the appropriate tools or who do not feel confident in attaching the filter holder themselves may take advantage of the chargeable installation service.

Bryan is usually spot on with his reports. All I know is that lenses that wide are very difficult to calibrate and focus precisely. I have no first hand experience with this lens yet and cannot comment on the AF consistency level. I am looking to acquire the lens in coming months once the demand settled and slightly used copies became available for sale. Once I got my hands on it and had a chance to run proper AF consistency tests on properly calibrated lens, I will be able to report back to you the outcomes.

that said both Sigma 85 Art and Sigma 135 Art that I own are very fast and consistently focusing lenses.

The product was still in development and was not available at the lens release time.

On par with my dog ate my homework.

The rear filter holder is an easy part to design. The gel sheet thickness is known in advance. The length of the side is the rear element diameter plus a little spare, so mechanical CAD software can adjust it automatically, and issue a warning if it protrudes into anything else. Making the metal pieces & connecting them at the back should be easier & faster than making the glass elements.

Sure, but Sigma is only a small private company and was working on getting 4 lenses out at the time and likely did not feel urgency to release an accessory in time with release seeing how limited the uptake of such an exotic filter holder will be amongst lens users.This accessory will not be available in Sigma or Nikon mount. Canon only. Likely due to some specific design constrain associated with Nikon and Sigma mount

Originally the purpose of this filter was described as:

This will allow more freedom of the expression when photographing starry skies.30.06.2017

As I know nothing about Astro photography, I cannot comment on how useful this feature may be for Astro photogs

The rear filter holder is an easy part to design. The gel sheet thickness is known in advance. The length of the side is the rear element diameter plus a little spare, so mechanical CAD software can adjust it automatically, and issue a warning if it protrudes into anything else. Making the metal pieces & connecting them at the back should be easier & faster than making the glass elements.

Sure, but Sigma is only a small private company and was working on getting 4 lenses out at the time and likely did not feel urgency to release an accessory in time with release seeing how limited the uptake of such an exotic filter holder will be amongst lens users.This accessory will not be available in Sigma or Nikon mount. Canon only. Likely due to some specific design constrain associated with Nikon and Sigma mount

Originally the purpose of this filter was described as:

This will allow more freedom of the expression when photographing starry skies.30.06.2017

As I know nothing about Astro photography, I cannot comment on how useful this feature may be for Astro photogs

The rear filter holder is an easy part to design. The gel sheet thickness is known in advance. The length of the side is the rear element diameter plus a little spare, so mechanical CAD software can adjust it automatically, and issue a warning if it protrudes into anything else. Making the metal pieces & connecting them at the back should be easier & faster than making the glass elements.

I can't see any use for it. it's for gel filters, so no light pollution filter will work.

Sure, but Sigma is only a small private company and was working on getting 4 lenses out at the time and likely did not feel urgency to release an accessory in time with release seeing how limited the uptake of such an exotic filter holder will be amongst lens users.This accessory will not be available in Sigma or Nikon mount. Canon only. Likely due to some specific design constrain associated with Nikon and Sigma mount

Originally the purpose of this filter was described as:

This will allow more freedom of the expression when photographing starry skies.30.06.2017

As I know nothing about Astro photography, I cannot comment on how useful this feature may be for Astro photogs

The rear filter holder is an easy part to design. The gel sheet thickness is known in advance. The length of the side is the rear element diameter plus a little spare, so mechanical CAD software can adjust it automatically, and issue a warning if it protrudes into anything else. Making the metal pieces & connecting them at the back should be easier & faster than making the glass elements.

I can't see any use for it. it's for gel filters, so no light pollution filter will work.

Just wait for Aurora Aperture to get one of these replacement. I predict that they will come up with a replacement holder which could take their glass ND filter (and maybe custom cut light pollution filter as well)./note: I cannot wait for them to ship my set of rear filters, and a filter holder. It will be an interesting engineering task to attach it onto my samyang 14 xp... /

Rear filters are a bit of a pain.It's got a quite large from end so front filters are an expensive option.It's a bit like the 11-24mm. There isn't a perfect solution for that either.I wonder could they make a didymium filter to fit at the rear. Does a didymium filter have to be glass?It's a nice lens. I haven't yet encountered focusing problems with it but it's very wide angle so things tend to be in focus. It works well for Astro.

Like others have mentioned, this should have been standard at the start of shipping. As someone who has worked with CAD software like Solidworks and as a mechanical engineer. Yea this would have been no more then an hour of someones time at most. Actually only 5 mins of their time, the other 55 is to make sure its perfect for production. IMHO, no lens should ever be designed and shipped without some form for filter in mind. Now you can get filter systems for these lenses that use the super large square filters, but they are costly. That said, those filter systems normally interfere with the focusing ring on the Sigma 11-24 Art. Which isn't to great since the lens is horrible at focusing.